Luminous mark measuring arrangement



29, @941. w, BABE-ZR LUHINOUS MARK MEASURING ARRANGEMENT Filed Nov.

19's?" 2 Sheets-Sheet 1 April 29, 1941. w BAUER wumous MARK mmszmme ARRANGEMENT 2 Sheets-Sheec, 2

Filed Nov. 24, 1937 Patented Apr. 29, 1941 LUMINOUS MARK DIEASURING ABRANGEDIENT Wilhelm Bader, Berlin-Charlottenburg, Germany,

assignor to Siemens & Halske, Aktlengeseilsehalt, Siemensstadt, near Berlin, Germany, a

corporation of Germany Application November 24, 1937, Serial No. 176,162

9 Claims.

The present invention relates to improvements in luminous mark measuring arrangements for recording the relationship betweena plurality of magnitudes to be measured.

Arrangements are known in the art in which the relationship between a plurality of magnitudes to be measured are made evident by coordinating corresponding measuring mechanisms provided with mirrors to the individual magnitudes to be measured and by directing. a beam of light coming from a light source throu h the mirrors of the measuring mechanism. In this case an image 01! a fixed diaphragm aperture,

illuminated by the light source, is preferably projected onto a screen. If the relationship between the magnitudes to be measured is to be recorded a photographic film may be employed as a screen.

My invention is illustrated in the accompanying drawings in which Fig. 1 represents an explanatory diagram.

Fig. 2 diagrammatically illustrates the effect of interposing a positive lens between two measuring mirrors according to the invention.

Figs, 3 and 4 are modifications oi Fig. 2 showing the use-of an inverting lens.

Fig 5 shows diagrammatically an arrangement for producing on the screen the sum or several rapidly varying magnitudes with the aid 0! a plurality of inverting lenses.

Fig. 6 showsan arrangement, similar to Fig. 5, in which hollow spherical mirrors are employed in place of inverting lenses.

Figs. 'lo-Vd show diagrammatically arrangements by which certain functional relations of a plurality of magnitudes can be reproduced on the screen by mirror and lens systems, Fig. 'la representing an elevation and Fig. 70 a plan view of the system, and s Fig. 8 shows diagrammatically an arrangement by which the relationship between severalmagnitudesv and a common reference magnitude can be reproduced on a screen.

In order to continuously record on a film, for instance, the sum of two magnitudes to be measured, two corresponding measuring instruments provided with mirrors may be employed whose axes of rotation lie parallel to each other. It now the film is moved by a clockwork the curve obtained represents the function 1h+1l:=f(t), where 111 and 112 are the corresponding magnitudes to m measured and t the time. A similar arrangement may, however, be also employed to represent the relationship between a magnitude 3/ to be measured and a magnitude 1c (reference magnitude). It the graphic representation is to Germany November 26, 1936 be carried out according to a rectangular system of coordinates both measuring mechanisms corresponding to the magnitudes to be measured 3 and u are so arranged that their axes of rotation are substantially at right angles to one another. The image of a diaphragm aperture in the form of a spot projected onto a screen by the beam of light reflected by both mirrors moves in such a manner that it records a curve y=f(x) The known arrangements have, however, the drawback that the conditions are very unfavorable if the measuring mechanism mirrors cannot be arranged very close to each other. For instance, in the case of the arrangement chosen in the explanatory diagram Fig. l the main 'ray of alight beam coming from a light source i strikes a screen 4 through two measuring mechanism mirrors 2 and 3 of which mirror 2 rotates on an axis at right angles to the drawing surface and mirror 3 rotates on an axis located in the plane of the drawing surface. The incident beam in the position of rest oi the measuring mechanism mirror 2 is so reflected by the latter that it strikes the mirror 3 at a point P1. Under these conditions and in case of deflection of the mirror 2 by an angle 4 corresponding to the magnitude to be measured; the beam will strike the mirror 3 at a point P: which is the more distant from P1 the greater the angle a: and the greater the distance d between the mirrors. Since the distance it depends, as a rule, upon thedimensions of the corresponding measuring mechanism, the mirror 3 of the second measuring mechanism even in the case of a small angle a: ofdeflection must be relatively very large, particularly in the direction or its rotation axis a. In this manner the moment of inertia and the weight of the corresponding measuring mechanism is increased in most cases in an undue manner. Consequently, it has hitherto been, for instance, impossible to design such an arrangement for cooperation with oscillograph loops in which only extremely small dimensions or the mirrors are permissible. The difliculties are still greater if the light beam is caused to be reflected by more than two measuring mechanism mirrors.

These drawbacks are removed according to the invention by arranging between each pair of measuring mechanism mirrors an optical system which projects one measuring mechanism mirror onto the other. It the light beam is caused to be reflected by more than two mirrors such an optical system which may consist of lenses or hollowmirrors is to be arranged between two adjacent measuring mechanism mirrors. In this manner the main ray of the light beam reflected by the first measuring mechanism mirror is always reflected again on the same point of the second measuring mechanism mirror even after the rotation of the first measuring mechanism mirror so that very small dimensions are sufllclent for all measuring mechanism mirrors.

It is particularly advantageous it the optical system is arranged between the measuring mechanism mirrors in such a manner that the angle at which the main beam leaves the optical system is equal to the angle of incidence. Ii a hollow mirror is employed as an optical system this condition is met with it the hollow mirror is distant an equal amount from both measuring mechanism mirrors. Also when using a positive lens the latter must be arranged midway between both measuring mechanism mirrors. In this manner the angles or inclination of the main ray on both measuring mechanism mirrors are always of the same magnitude and therefore the angular paths of all measuring mechanism mirrors have the same length or the light spot, corresponding to the distance l of the screen from the last measuring mechanism mirror, 1. e., the same optical sensitiveness in the record.

This case is shown in 2 in which the main beam is projected from the light source i onto a screen 4 through the measuring mechanism mirrors 2 and 3 rotatably disposed similar to mirrors 2 and 3 of Fig. 1. Midway between mirrors 2 and 3 is placed a positive lens of such a focal length that the center of the mirror 2 is always projected onto the center of the mirror I. It now the mirror 2 is rotated through angle 2:, the main beam deflected by an angle 21: strikes the lens 5 and is projected by the latter onto the same point P of the mirror 3 under the same angle 22:

and upon being reflected by the latter mirror on the screen 4 is reflected again at the same angle 22. It now the mirror 3 is, for instance, deflected by an angle 1/ under the influence of'the corresponding magnitude to be measured, the main beam is further deflected perpendicularly to the plane of the drawing by an angle 2:; so that upon the simultaneous movement of both measuring mechanism mirrors the light point records on the screen 4 a curve which corresponds to the function 1=f(:t). Since in this case both mirror surfaces may be chosen very small, standard oscillograph loops may be employed as measuring mechanisms and in this manner the relationship between two magnitudes varying very rapidly may be recorded.

If the instantaneous values of various magnitudes to be measured should be added together and the variations with respect to time of the sums thus obtained recorded, substantially the same arrangement may be employed, in which case, however, all measuring mechanisms are to be arranged with their axes of rotation in parallel.

In order to produce a sharp image on the screen 4 of a diaphragm aperture illuminated by a light source I, a positive lens may be arranged between the second mechanism mirror 3 and the screen 4 in such manner that the positive lens will project a real image 01. the screen 4 between the focus of the optical system 5 nearest the screen 4 and the measuring mechanism mirror 3, which image corresponds to the image of the diaphragm projected by the optical system 5.

Such an arrangement is shown in Fig. 3 for the clearness of illustration with the main beam stretched out in a straight line. The arrangement corresponds to that shown in Fig. 2, except that between the light source i and the measuring mechanism mirror 2 are placed a condenser lens 6 and a diaphragm 1. Furthermore, a positive lens 8 is placed between the measuring mechanism mirror 3 and the screen 4. The focuses of the inverting lens 5 are denoted by F1 and F2.

I! the path of beam is traced backwards irom the screen 4 the lens 8 is so dimensioned and arranged that it would produce a real image of the screen 4 in a plane 1' between F2 and 8. However, the diaphragm l is so arranged that the inverting lens 5 projects an image of the diaphragm 1 onto the same plane I so that the image of the diaphragm, as above described, is projected onto the screen 4.

Another possibility which otters advantages in some cases consists in arranging between the diaphragm and the first measuring mechanism mirror 2 a positive lens which produces an image of the diaphragm between the measuring mechanism 2 and the focus of the optical system 5 nearest the light source, "which image again projected onto the screen t by the optical system 5.

Such an arrangement is shown in Fig. 4, the main beam being also here shown as extending in a straight line. Here a positive lens 8 is arranged in front oi. the measuring mechanism mirror 2 in such a manner that it projects an image of the diaphragm '1 onto a plane '1" between the mirror 1 and the focus Fr of lens I, which image is then projected onto the screen 4 by the lens 5. If the diaphragm aperture 7 is to be illuminated by a condenser lens 6 the latter is preferably so dimensioned and arranged that the light source I is projected onto the first measuring mechanism mirror 2. In an arrangement as shown in Fig. 4 this is accomplished with the aid of the lens I.

If the sum or several rapidly varying magnitudes to be measured is to be recorded in accordance with time with the aid of oscillograph measuring mechanisms the arrangement schematically shown in Fig. 5 may, for instance, be employed. In this case it is assumed that the deflections of four oscillograph loops 9, in, H, II are added together whose axes of rotation, as illustrated by the double head arrows, lie in the plane of the drawing. The main beam emanating from the light source I ialls on the first oscillograph mirror 9 through the condenser lens 6. the diaphragm aperture 1 and the lens 8', then on the second oscillograph mirror Ill through an inverting lens 5, on the third oscillograph mirror ll through another inverting lens 5', and on the fourth mirror I2 through the inverting lens 5" from which mirror it is projected onto a moving film ii.

In general, it is preferable to maintain the angles of reflection of the measuring mechanism mirrors as small as possible. It is therefore desirable as illustrated in Fig. 5 to use in such a case only lens segments 5, 5, 5 whose width, perpendicular to the direction of deflection of the light spot, is suitably chosen.

With respect to the usual arrangement of the measuring loops in the case of multiple loop oscillographs, the construction shown in Fig. 6 is, however, more of the inverting lenses spherical hollow mirrors l4, l4, I4" are employed as optical systems. These mirrors are so arranged that a hollow mirror is opposite to every two adjacent measuradvantageous in which instead ing mechanism mirrors at a distance corresponding to the radius of curvature thereof. For instance, the center of the measuring mechanism mirror 9 is therefore projected onto the center of the measuring mechanism mirror l through the hollow mirror l4 etc. In this case the arrangement usual in oscillographs may also be employed, in which the diaphragm I is designed as a slit diaphragm, and the image obtained is concentrated to a point on the photographic film i3 by a cylindrical lens l5.

With an arrangement as shown in Figs. 5 and 6, for instance, the periodical variations of the instantaneous energy value of a three-phase alternating current system may be recorded with the aid of three oscillograph mirrors which are controlled by wattmetric measuring mechanisms for the three phases. In the case of three-phase current systems without neutral wire even two wattmetric oscillograph loops are sufiicient in the known two wattmeter connection.

Figs. 7a to 7d illustrate a function a=flm in a rectangular system of axes, where t=$5+$s and c==y1+ya For the determination of the mag-=- nitudes to be measured 5:1, 2:2, or, so the measur- 0 ing mechanisms it, ll, it, it are employed which carry mirrors correspondingly denoted. The sum ri-i-mz is formed by the measuring mechanisms it and ii, for instance, with vertical axis of rotation and the sum 311+ by the measuring mechanisms l8 and 99 with horizontal axis of rotation. i In the drawings Fig. 7a is to be considered as an elevational view and Fig. 70 as a plan view. In this case for clearness of illustration the measuring mechanism mirror is in Fig. la and the measuring mechanism mirror it in Fig. 7c are not shown.

The main beam coming from the light source i passes through the lens 6, the diaphragm aperture i and the lens 8 to the mirror it and then at first in a perpendicular plane through a lens segment 2B, the mirror ll and a lens segment 2| to the mirror i8 and then in a horizontal plane through a lens segment 22 in Fig. 7c and the mirror is to the screen 23 striking the latter in point 0 (see Figs. W, W), provided that all mirrors are in zero position. If :m and z: denote the deflections of the mirrors "l8 and i! respectively and 3/1, .742 those of the mirrors i8 and i9, the light spot reflected by the mirror i9 is de- :flected in accordance with the sum x==xi+zm in the horizontal direction and in accordance with the sum p za-H12 in the vertical direction so that a curve y=fixi results on the screen it represented in the corresponding projection in Figs. 7b and id. Each magnitude x or 21 may, oi course, be also represented as a sum of any number of values by a corresponding number of measuring mechanisms.

Fig. c shows an arrangement in diagrammatic form which may be employed to represent at the same time the relationship between various magnitudes to be measured in, 212, ya and a com mon reference magnitude :c. To this end, a measuring mechanism mirror 2d controlled lay the reference magnitude r and having, ior instance,

an axis of rotation lying in the plane of the drawing is provided as well as three measuring mechanism mirrors 25, it, it'll responsive to the magnitudes 111, ya. so and having axes of rotation perpendicular to the plane of the drawing. In order to provide a special light spot for each of these measuring mechanisms three diaphragm apertures la, 1b, 1c are arranged side by side behind the condenser lens 8 so that three separate light beams result whose main rays are concentrated on the measuring mechanism mirror 24 through the lens 8'. The rays are so reflected from the mirror 24 that the ray passing through the diaphragm 'Ic strikes the measuring mechanism mirror 25 through a lens segment 280, the ray passing through the diaphragm lb the measuring mechanism mirror 26 through a lens segment 28!] and the ray passing through thediaphragm la strikes the measuring mechanism mirror 2! through a lens segment 28a. The mirrors 2'5, 26, 21 are preferably so arranged that the three light spots produce luminous points on the screen 29 which are concentrated to a point 0 provided that all measuring mechanism mirrors be in the zero position. If the reference magnitude 1: changes, the luminous points wander on the. screen 28 perpendicular to the plane of the drawing, whereas the deviation of the measuring mechanism mirrors 25, 28, 2'! causes them to wander in the plane of the drawing in accordance with the magnitudes to he measured 211, 312, so. Conseouentiy, the curves are produced on the screen (29 corresponding to the functions i11=fi (it) ya=fs (a) and ifs=fs (x) in this manner it is possible to photographically record in the same system of coordinates on a light-sensitive layer, for instance, by means of corresponding oscillograph loops at the same time the relationship between any number of magnitudes to he measured and a reference magnitude.

in a similar manner any number of values or, 112 which are again composed of the sums 7J1=1Jn+2hz+ and y2=yz1+un+ of other magnitudes to he measured may be represented in accordance with a reference magnitude x. Reverseiy, the relationship between any number of magnitudes to, 1/2 and a reference magnitude :r. may be represented which is again formed of the sum z=rsi+zcz+ of a number of magnitudes to be measured. In general, the simultaneous representation of various functions of the form y1i+yi2+ =f1(:c1+x2+ y2i+y22+ =f2(:171+:172+

etc, is therefore also possible.

What is claimed is:

l. Means for producing a graph by a luminous spot for recording the relationship between several varying operating forces, comprising a light beam source, a diaphragm illuminated by said beam, 2. screen spaced from said source, at least two movable mirrors, each controllable in its movements by one of said iorces and shaped and disposed to reflect said beam from. one mirror onto the other and onto said screen, and means 101' producing on the screen an image or said diaphragm, said means comprising in optical alignment an optical converging means and he- 2. Means for producing a graph by a luminous spot for recording the relationship between several varying operating forces, comprising a light beam source, a diaphragm illuminated by said beam, a screen spaced from said source, at least two movable mirrors, each controllable in its movements by one of said forces and shaped and disposed to reflect said beam from one mirror onto the other and onto said screen, and means for producing on the screen an image of said diaphragm, said means comprising in optical alignment a positive lens means and midway in the beam path between said mirrors a hollow mirror designed and focused to project the image of one of said force operated mirrors onto the other and both being positioned between said diaphragm and said screen, whereby the beam reflected by one movable mirror is always focused onto the same point of the next movable mirror irrespective of the angle-within the optical range of the system-through which the first-named mirror has been deflected, and whereby the track of the diaphragm image pro duced on said screen graphically represents the resultant function of said forces.

3. Means for producing a graph by a luminous spot for recording the relationship between several varying operating forces, comprising a light beam source, a diaphragm illuminated by said beam, a screen spaced from said source, at least two movable mirrors, each controllable in its movements by one 01 said forces and shaped and disposed to reflect said beam from one mirror onto the other and onto said screen, and means for producing on the screen an image of said diaphragm, said means comprising in optical alignment an optical converging means and midway in the beam path between said mirrors another optical converging means designed and focused to project the image of one of said mirrors onto the other, said two converging means being positioned between said diaphragm and said screen, whereby the beam reflected by one movable mlr'ror is always focused onto the same point of the next movable mirror irrespective of the angle-within the optical range of the system-- through which the first-named mirror has been deflected, and whereby the track of the diaphragm image produced on said screen graphically represents the resultant function of said forces.

4. Means for producing a graph by a luminous spot for recording the relationship between several varying operating forces, comprising a light beam source, a diaphragm illuminated by said beam, a screen spaced from said source, at least two movable mirrors, each controllable in its movements by one of said forces and shaped and disposed to reflect said beam from one mirror onto the other and onto said screen, and means for producing on the screen an image of said diaphragm, comprising between said pair of mirrats an optical system focused to project the image of one of said mirrors onto the other, and optical converging means disposed between said screen and said mirror nearest said screen, said converging means being focused to project a real image of said screen onto a plane between said of the system-through which the first-named mirror has been deflected, and whereby the track of the diaphragm image produced on said screen graphically represents the resultant function of said forces.

5. Means for producing a graph by a luminous spot for recording the relationship between several varying operating forces, comprising a light beam source, a diaphragm illuminated by said beam, a screen spaced from said source, at least two movable mirrors, each controllable in its movements by one of said forces and shaped and disposed to reflect said beam from, one mirror onto the other and onto said screen, and means for producing on the screen an image of said diaphragm, comprising between said pair of mirrors an optical system focused to project the image of one of said mirrors onto the other, and a positive lens disposed between said diaphragm and the first movable mirror and iocused to project an image 02 said diaphragm at a point between said first mirror and the focal point of said optical system nearest the light beam source, of which diaphragm image an image is projected onto said screen by said optical system, whereby the beam reflected by one movable mirror is always focused onto the same point of the next movable mirror irrespective of the angle-within the optical range of the system--through which the flrst-named mirror has been deflected, and whereby the track of the diaphragm image produced on said screen graphically represents the resultant function of said forces.

6. Means for producing a graph by a luminous spot for graphically summing up the instants.- neous values of a plurality of operating forces, comprising a light beam source, a diaphragm illuminated by said beam, a screen spaced from said source, a plurality of oscillatable mirrors, each connected to respond to the reactions of one of said forces, said mirrors having their oscillating axes in parallel to one another and being disposed in the path of said beam to reflect the diaphragm onto said screen, means for producing on said screen an image of said diaphragm, comprising in optical alignment an optical converging means, and an optical system disposed midway between each pair of adjacent mirrors and focused to project the image of one mirror onto the other, whereby the beam reflected by one movable mirror always focused onto the same point of the next movable mirror irrespcm tive of the angle--within the optical range of the system through which the iirst-11amecl mirror has been deflected, and whereby the track of the diaphragm image produced on said screen graphically represents the sum of the individual values of said forces.

'7. Means for producing a graph by a luminous spot for graphically summing up the instantaneous values of a plurality of operating forces, comprising a light beam source, a diaphragm illuminated by said beam, 11 screen spaced from said source, a plurality of oscillatable mirrors, each connected to respond to the reactions of one of said forces, said mirrors having their oscillating axes in parallel to one another and being disposed in the path of said beam to reflect the diaphragm onto said screen, means for producing on said screen an image of said diaphragm, comprising in optical alignment a positive lens means and another positive lens means disposed midway between each pair of successive mirrors and focused to project the image of one mirror onto the other, whereby the beam reflected by one movable mirror is always focused onto the same point of the next movable mirror iTYESPECtlVG'Qf the angle-within the optical range of the system-through which the firstnamed mirror has been deflected, and whereby the track of the diaphragm image produced on said screen graphically represents the sum of the values of said forces.

8. Means for producing a graph by a luminous spot for graphically summing up the instantaneous values of a plurality of operating forces, comprising a light beam source, a diaphragm illuminated by said beam, a screen spaced from said source, a plurality of oscillatable mirrors, each connected to respond to the reactions of one of said forces, said mirrors being arranged side by side and all having their oscillating axes in parallel, means for producing on said screen an image of said diaphragm, comprising in optical alignment a positive lens means, and a hollow mirror disposed opposite each pair of successive mirrors at a distance corresponding to the curvature radius of the mirror to project the image of one mirror onto the other, said screen being disposed to receive the reflection from the last mirror, whereby the beam reflected by one movable mirror is always focused onto the same point of the next movable mirror irrespective of the angle-within the optical range of the system-through which the first-named mirror has been deflected, and whereby the diaphragm is projected onto said screen and its track graphically represents the sum of the individual values of said forces.

9. Means for producing a graph by a luminous spot for graphically representing the relationship between at least one reference force and a plurality of forces to be investigated, comprising a light beam source, a diaphragm illuminated by said beam, 2, screen spaced from said source, an oscillatable mirror for each force disposed to be actuated thereby, said mirrors being arranged so that said diaphragm is reflected through said mirrors onto said screen, the oscillating axes of the mirrors for each kind of force being disposed in parallel relation to one another and being disposed substantially at right angles to the mirror axes for the other kind of force, means for producing on said screen an image of said diaphragm, comprising in optical alignment a positive lens means, and an optical systern disposed midway between each pair of mirrors successively passed by said beam and focused to project the image of one of said mirrors onto the other, whereby the beam reflected by one movable mirror is always focused onto the same point of the next movable mirror ir respective of the angle -within the optical range of the systemthrcugh which the first-named mirror has been deflected, and whereby the track of the diaphragm image produced on said screen graphically represents the relation between the investigated forces and the reference Iorce.

WILHEIM BADER. 

